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drill collar
eng.geol. 钻头加重杆
met. 钻铤
tech. 钻孔口; 加长钻铤; 钻环
drill collar: 114 phrases in 7 subjects
Drilling38
Earth sciences4
Explosives and Explosive Ordnance Disposal2
Mechanics3
Metallurgy1
Oil / petroleum54
Technology12

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